Instrument tower



FIG. 1 is a top, front, left perspective view of an instrument tower;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

In the drawings, the broken lines are for the purpose of illustrating portions of the instrument tower that form no part of the claimed design. 

CLAIM The ornamental design for an instrument tower, as shown and described. 